21002020021011 has 8 divisors (see below), whose sum is σ = 28046243431360. Its totient is φ = 13979571645672.

The previous prime is 21002020021001. The next prime is 21002020021033. The reversal of 21002020021011 is 11012002020012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21002020021011 - 2¹¹ = 21002020018963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002020021001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5443756501 + ... + 5443760358.

It is an arithmetic number, because the mean of its divisors is an integer number (3505780428920).

Almost surely, 2^{21002020021011} is an apocalyptic number.

21002020021011 is a deficient number, since it is larger than the sum of its proper divisors (7044223410349).

21002020021011 is a wasteful number, since it uses less digits than its factorization.

21002020021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10887517505.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21002020021011 its reverse (11012002020012), we get a palindrome (32014022041023).

The spelling of 21002020021011 in words is "twenty-one trillion, two billion, twenty million, twenty-one thousand, eleven".